/* ***** BEGIN LICENSE BLOCK *****
 *   Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Save File to.
 *
 * The Initial Developer of the Original Code is
 * Atte Kemppilä.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * 
 * ***** END LICENSE BLOCK ***** */


var EXPORTED_SYMBOLS = [];

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;

Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");

Cu.import("resource://savefileto/constants.jsm");


function onEnterPrivateBrowsing()
{
    // backup recently used folders
    var prefs = Services.prefs.getBranch(EXT_PREF_BRANCH);
    for each (var type in TYPES)
    {
        var value = prefs.getCharPref(type + ".recent");
        prefs.setCharPref(type + ".recent.backup", value);
    }
}

function onExitPrivateBrowsing()
{
    // restore recently used folders from backup overwriting the private browsing mode value
    var prefs = Services.prefs.getBranch(EXT_PREF_BRANCH);
    for each (var type in TYPES)
    {
        var value = prefs.getCharPref(type + ".recent.backup");
        prefs.clearUserPref(type + ".recent.backup");
        prefs.setCharPref(type + ".recent", value);
    }
}

// nsIObserver
var observer =
{
    QueryInterface: XPCOMUtils.generateQI([
        Ci.nsIObserver,
        Ci.nsISupportsWeakReference]),
    
    observe: function(subject, topic, data)
    {
        if (topic != "private-browsing")
            return;
        
        if (data == "enter")
            onEnterPrivateBrowsing();
        else if (data == "exit")
            onExitPrivateBrowsing();
    }
}


Services.obs.addObserver(observer, "private-browsing", true);

if (Cc["@mozilla.org/privatebrowsing;1"].getService(Ci.nsIPrivateBrowsingService).privateBrowsingEnabled)
    onEnterPrivateBrowsing();
